The heart's pulmonary system sends blood low in oxygen and high in carbon dioxide to the lungs where oxygen is picked up and carbon dioxide is dropped off.This happens where capillaries of the circulatory system interact with ___________ of the lungs. This _____________ blood is then returned to the ____________ where the ____________ circulation sends it to all parts of the__________. As oxygen is consumed by the __________, the blood becomes _____________ and is returned to the ____________.

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